High frequency fields

High frequency electromagnetic fields cover the frequency range from 100 kHz to 300 GHz of the electromagnetic spectrum. In general they are distributed by an antenna. They are able to distribute energy and information over a great distance.

Because high frequency electromagnetic fields are used for multiple purposes (e. g. radio and TV broadcast, mobile communication, cordless phones, wireless LAN and bluetooth connections) we are surrounded by a large number of different emitting facilities operating at various transmitting powers and frequencies.

Electric and magnetic fields in the frequency range between 100 kilohertz and 300 gigahertz are referred to as high-frequency fields. As electric and magnetic fields are closely coupled at high frequencies, they are also called "electromagnetic" fields.

Baby monitors are electrical devices and produce low-frequency electric and magnetic fields in the 50 Hz range if they are powered by electricity from the socket. Radio-operated devices use high-frequency electromagnetic fields to transmit sounds. They use two different technologies to transfer noise from the nursery to parents and thus give them the opportunity to control their babies or toddlers from the distance: the electrical grid of the house or flat or a radio system. Today most of the baby monitors apply wireless communication.

Especially at airports full-body scanners are increasingly used for security screening (passenger screening). The devices can detect and locate forbidden objects concealed under a person’s clothing. In contrast to metal detectors used extensively at passenger airports, the new devices also respond to non-metallic objects such as explosives.